2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/bug.h>
20 #include <linux/types.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/errno.h>
24 #include <linux/iommu.h>
26 static struct iommu_ops *iommu_ops;
28 void register_iommu(struct iommu_ops *ops)
36 bool iommu_found(void)
38 return iommu_ops != NULL;
40 EXPORT_SYMBOL_GPL(iommu_found);
43 * iommu_set_fault_handler() - set a fault handler for an iommu domain
44 * @domain: iommu domain
45 * @handler: fault handler
47 * This function should be used by IOMMU users which want to be notified
48 * whenever an IOMMU fault happens.
50 * The fault handler itself should return 0 on success, and an appropriate
51 * error code otherwise.
53 void iommu_set_fault_handler(struct iommu_domain *domain,
54 iommu_fault_handler_t handler)
58 domain->handler = handler;
60 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
62 struct iommu_domain *iommu_domain_alloc(void)
64 struct iommu_domain *domain;
67 domain = kmalloc(sizeof(*domain), GFP_KERNEL);
71 ret = iommu_ops->domain_init(domain);
82 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
84 void iommu_domain_free(struct iommu_domain *domain)
86 iommu_ops->domain_destroy(domain);
89 EXPORT_SYMBOL_GPL(iommu_domain_free);
91 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
93 return iommu_ops->attach_dev(domain, dev);
95 EXPORT_SYMBOL_GPL(iommu_attach_device);
97 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
99 iommu_ops->detach_dev(domain, dev);
101 EXPORT_SYMBOL_GPL(iommu_detach_device);
103 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
106 return iommu_ops->iova_to_phys(domain, iova);
108 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
110 int iommu_domain_has_cap(struct iommu_domain *domain,
113 return iommu_ops->domain_has_cap(domain, cap);
115 EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
117 int iommu_map(struct iommu_domain *domain, unsigned long iova,
118 phys_addr_t paddr, int gfp_order, int prot)
120 unsigned long invalid_mask;
123 size = 0x1000UL << gfp_order;
124 invalid_mask = size - 1;
126 BUG_ON((iova | paddr) & invalid_mask);
128 return iommu_ops->map(domain, iova, paddr, gfp_order, prot);
130 EXPORT_SYMBOL_GPL(iommu_map);
132 int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
134 unsigned long invalid_mask;
137 size = 0x1000UL << gfp_order;
138 invalid_mask = size - 1;
140 BUG_ON(iova & invalid_mask);
142 return iommu_ops->unmap(domain, iova, gfp_order);
144 EXPORT_SYMBOL_GPL(iommu_unmap);